Issue with stalling when in gear

So here is where we stand. Lots of good info from everyone. Thanks. Looked at the points. Brand new. Checked the gap was good. Put my timing light on it and put at 0. Now the car runs good and does not stall in gear. But now is flooding and hard to start. I am now looking at the air mixture screw. When I take off from a stop now hesitates to go. Sometimes it dies. Getting closer. It has the Holley 1920 carb. Fuel pump is new also. That was all replaced by the previous owners. The only thing I have done was replace the gas tank. It had a lot of rush in it and when I filled it up it leaked out the sending unit. Now might be the time for the vac gauge?